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A digitized version of the work can be found at the Internet Archive:
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Insecta Britannica Diptera is a seminal work of entomology by Francis Walker. The work spans three volumes; a fourth volume was never published. Parts of the work were credited by Walker to Alexander Henry Haliday, including the characters and synoptic tables of the Empididae, Syrphidae, and Dolichopodidae [1] and addenda and corrigenda intended for volume 4. [2]
The precise dates of early entomological publications are frequently hard to establish.
A digitized version of the work can be found at the Internet Archive:
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